[gnome-panel] panel.c: don't crash clicking on panel handle

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 098df5e7bc0b0778e51b3b0410c0587eec62f952
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Nov 21 04:18:36 2014 +0200

    panel.c: don't crash clicking on panel handle
    
    Documentation says that gtk_get_current_event can return NULL.
    Also returned value must be freed.
    
    https://developer.gnome.org/gtk3/stable/gtk3-General.html#gtk-get-current-event

 gnome-panel/panel.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/gnome-panel/panel.c b/gnome-panel/panel.c
index c952f68..26b5322 100644
--- a/gnome-panel/panel.c
+++ b/gnome-panel/panel.c
@@ -309,11 +309,16 @@ panel_popup_menu (PanelToplevel *toplevel,
        panel_data   = g_object_get_data (G_OBJECT (toplevel), "PanelData");
 
        current_event = gtk_get_current_event ();
+       if (!current_event)
+               return FALSE;
+
        if (current_event->type == GDK_BUTTON_PRESS)
                panel_data->insert_pack_type = panel_widget_get_insert_pack_type_at_cursor (panel_widget);
        else
                panel_data->insert_pack_type = PANEL_OBJECT_PACK_START;
-       
+
+       gdk_event_free (current_event);
+
        menu = make_popup_panel_menu (panel_widget);
        if (!menu)
                return FALSE;